1. Quantitative Methods PSY302 Quiz Chapter Six Confidence Intervals

2. 1. We calculate the sample mean in order to: A.practice with Excel B.prove the null hypothesis C.create sampling error D.decrease confirmation bias E.estimate the population mean

3. 1. We calculate the sample mean in order to: A.practice with Excel B.prove the null hypothesis C.create sampling error D.decrease confirmation bias E.estimate the population mean

4. 2. A range of values within which the true mean of the population is believed to exist is called a. (105) A.standard deviation B.non random sample C.research design or meta-analysis D.frequency distribution E.confidence interval

5. 2. A range of values within which the true mean of the population is believed to exist is called a. (105) A.standard deviation B.non random sample C.research design or meta-analysis D.frequency distribution E.confidence interval

6. 3. The Z score for a 95% confidence interval is: (107) A.2.58 B.-1.11 C.1.96 D..002 E..5

7. 3. The Z score for a 95% confidence interval is: (107) A.2.58 B.-1.11 C.1.96 D..002 E..5

8. 4. In the sampling distribution of means shown below what is on the X axis? A.frequency B.raw score C.the variance D.the mean E.all of the above

9. 4. In the sampling distribution of means shown below what is on the X axis? A.frequency B.raw score C.the variance D.the mean E.all of the above

10. 5. I have an estimate based on a mean of 50 with a margin of error of 10. What would be the upper limit of my confidence interval? A.35 B.60 C.55 D.40 E.50

11. 5. I have an estimate based on a mean of 50 with a margin of error of 10. What would be the upper limit of my confidence interval? A.35 B.60 C.55 D.40 E.50

12. 6. For a 95% confidence interval, the formula for the margin of error is the Z-score (i.e. 1.96) times: A.μ B..95 C.the standard error D.sample mean E.population mean

13. 6. For a 95% confidence interval, the formula for the margin of error is the Z-score (i.e. 1.96) times: A.μ B..95 C.the standard error D.sample mean E.population mean

14. 7. As n increases the standard error: (111) A.remains the same B.increases C.decreases D.doubles E.turns to zero

15. 7. As n increases the standard error: (111) A.remains the same B.increases C.decreases D.doubles E.turns to zero

16. 8. When you divided the standard deviation of the population by the square root of n (the sample size) you have the: A.standard error B.mean C.correlation coefficient D.confidence interval E.sum of squares

17. 8. When you divided the standard deviation of the population by the square root of n (the sample size) you have the: A.standard error B.mean C.correlation coefficient D.confidence interval E.sum of squares

18. 9. A 95% confidence interval is constructed so that it will capture the true mean of the population: (115) A.never B.always C.99% of the time D.95% of the time E.On president’s day The error bars on the figures represent the 95 percent confidence interval.

19. 9. A 95% confidence interval is constructed so that it will capture the true mean of the population: (115) A.never B.always C.99% of the time D.95% of the time E.On president’s day The error bars on the figures represent the 95 percent confidence interval.

20. 10. The X axis of a sampling distribution of the means shows the: A.value of the mean B.Z score C.the number of standard errors above or below the mean D.all of the above

21. 10. The X axis of a sampling distribution of the means shows the: A.value of the mean B.Z score C.the number of standard errors above or below the mean D.all of the above

22. The End

23. 1.e 2.e 3.c 4.d 5.b 6.c 7.c 8.a 9.d 10.d